Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, openWorldHint=true, and destructiveHint=false, which covers the safety profile. The description adds value by specifying freshness and authoritative source URL, which hints at live data behavior beyond static annotations. However, it doesn't detail risk around open-world data or examples of failure cases, so it's adequate but not rich.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.